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   1 /*
   2  * debug.c - ACPI debug interface to userspace.
   3  */
   4
   5 #include <linux/proc_fs.h>
   6 #include <linux/seq_file.h>
   7 #include <linux/init.h>
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/moduleparam.h>
  11 #include <asm/uaccess.h>
  12 #include <acpi/acpi_drivers.h>
  13
  14 #define _COMPONENT              ACPI_SYSTEM_COMPONENT
  15 ACPI_MODULE_NAME("debug");
  16
  17 struct acpi_dlayer {
  18         const char *name;
  19         unsigned long value;
  20 };
  21 struct acpi_dlevel {
  22         const char *name;
  23         unsigned long value;
  24 };
  25 #define ACPI_DEBUG_INIT(v)      { .name = #v, .value = v }
  26
  27 static const struct acpi_dlayer acpi_debug_layers[] = {
  28         ACPI_DEBUG_INIT(ACPI_UTILITIES),
  29         ACPI_DEBUG_INIT(ACPI_HARDWARE),
  30         ACPI_DEBUG_INIT(ACPI_EVENTS),
  31         ACPI_DEBUG_INIT(ACPI_TABLES),
  32         ACPI_DEBUG_INIT(ACPI_NAMESPACE),
  33         ACPI_DEBUG_INIT(ACPI_PARSER),
  34         ACPI_DEBUG_INIT(ACPI_DISPATCHER),
  35         ACPI_DEBUG_INIT(ACPI_EXECUTER),
  36         ACPI_DEBUG_INIT(ACPI_RESOURCES),
  37         ACPI_DEBUG_INIT(ACPI_CA_DEBUGGER),
  38         ACPI_DEBUG_INIT(ACPI_OS_SERVICES),
  39         ACPI_DEBUG_INIT(ACPI_CA_DISASSEMBLER),
  40         ACPI_DEBUG_INIT(ACPI_COMPILER),
  41         ACPI_DEBUG_INIT(ACPI_TOOLS),
  42
  43         ACPI_DEBUG_INIT(ACPI_BUS_COMPONENT),
  44         ACPI_DEBUG_INIT(ACPI_AC_COMPONENT),
  45         ACPI_DEBUG_INIT(ACPI_BATTERY_COMPONENT),
  46         ACPI_DEBUG_INIT(ACPI_BUTTON_COMPONENT),
  47         ACPI_DEBUG_INIT(ACPI_SBS_COMPONENT),
  48         ACPI_DEBUG_INIT(ACPI_FAN_COMPONENT),
  49         ACPI_DEBUG_INIT(ACPI_PCI_COMPONENT),
  50         ACPI_DEBUG_INIT(ACPI_POWER_COMPONENT),
  51         ACPI_DEBUG_INIT(ACPI_CONTAINER_COMPONENT),
  52         ACPI_DEBUG_INIT(ACPI_SYSTEM_COMPONENT),
  53         ACPI_DEBUG_INIT(ACPI_THERMAL_COMPONENT),
  54         ACPI_DEBUG_INIT(ACPI_MEMORY_DEVICE_COMPONENT),
  55         ACPI_DEBUG_INIT(ACPI_VIDEO_COMPONENT),
  56         ACPI_DEBUG_INIT(ACPI_PROCESSOR_COMPONENT),
  57 };
  58
  59 static const struct acpi_dlevel acpi_debug_levels[] = {
  60         ACPI_DEBUG_INIT(ACPI_LV_INIT),
  61         ACPI_DEBUG_INIT(ACPI_LV_DEBUG_OBJECT),
  62         ACPI_DEBUG_INIT(ACPI_LV_INFO),
  63
  64         ACPI_DEBUG_INIT(ACPI_LV_INIT_NAMES),
  65         ACPI_DEBUG_INIT(ACPI_LV_PARSE),
  66         ACPI_DEBUG_INIT(ACPI_LV_LOAD),
  67         ACPI_DEBUG_INIT(ACPI_LV_DISPATCH),
  68         ACPI_DEBUG_INIT(ACPI_LV_EXEC),
  69         ACPI_DEBUG_INIT(ACPI_LV_NAMES),
  70         ACPI_DEBUG_INIT(ACPI_LV_OPREGION),
  71         ACPI_DEBUG_INIT(ACPI_LV_BFIELD),
  72         ACPI_DEBUG_INIT(ACPI_LV_TABLES),
  73         ACPI_DEBUG_INIT(ACPI_LV_VALUES),
  74         ACPI_DEBUG_INIT(ACPI_LV_OBJECTS),
  75         ACPI_DEBUG_INIT(ACPI_LV_RESOURCES),
  76         ACPI_DEBUG_INIT(ACPI_LV_USER_REQUESTS),
  77         ACPI_DEBUG_INIT(ACPI_LV_PACKAGE),
  78
  79         ACPI_DEBUG_INIT(ACPI_LV_ALLOCATIONS),
  80         ACPI_DEBUG_INIT(ACPI_LV_FUNCTIONS),
  81         ACPI_DEBUG_INIT(ACPI_LV_OPTIMIZATIONS),
  82
  83         ACPI_DEBUG_INIT(ACPI_LV_MUTEX),
  84         ACPI_DEBUG_INIT(ACPI_LV_THREADS),
  85         ACPI_DEBUG_INIT(ACPI_LV_IO),
  86         ACPI_DEBUG_INIT(ACPI_LV_INTERRUPTS),
  87
  88         ACPI_DEBUG_INIT(ACPI_LV_AML_DISASSEMBLE),
  89         ACPI_DEBUG_INIT(ACPI_LV_VERBOSE_INFO),
  90         ACPI_DEBUG_INIT(ACPI_LV_FULL_TABLES),
  91         ACPI_DEBUG_INIT(ACPI_LV_EVENTS),
  92 };
  93
  94 /* --------------------------------------------------------------------------
  95                               FS Interface (/sys)
  96    -------------------------------------------------------------------------- */
  97 static int param_get_debug_layer(char *buffer, struct kernel_param *kp) {
  98         int result = 0;
  99         int i;
 100
 101         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 102
 103         for(i = 0; i <ARRAY_SIZE(acpi_debug_layers); i++) {
 104                 result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
 105                                         acpi_debug_layers[i].name,
 106                                         acpi_debug_layers[i].value,
 107                                         (acpi_dbg_layer & acpi_debug_layers[i].value) ? '*' : ' ');
 108         }
 109         result += sprintf(buffer+result, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 110                                         ACPI_ALL_DRIVERS,
 111                                         (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 112                                         ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
 113                                         ACPI_ALL_DRIVERS) == 0 ? ' ' : '-');
 114         result += sprintf(buffer+result, "--\ndebug_layer = 0x%08X ( * = enabled)\n", acpi_dbg_layer);
 115
 116         return result;
 117 }
 118
 119 static int param_get_debug_level(char *buffer, struct kernel_param *kp) {
 120         int result = 0;
 121         int i;
 122
 123         result = sprintf(buffer, "%-25s\tHex        SET\n", "Description");
 124
 125         for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 126                 result += sprintf(buffer+result, "%-25s\t0x%08lX [%c]\n",
 127                                      acpi_debug_levels[i].name,
 128                                      acpi_debug_levels[i].value,
 129                                      (acpi_dbg_level & acpi_debug_levels[i].
 130                                       value) ? '*' : ' ');
 131         }
 132         result += sprintf(buffer+result, "--\ndebug_level = 0x%08X (* = enabled)\n",
 133                              acpi_dbg_level);
 134
 135         return result;
 136 }
 137
 138 module_param_call(debug_layer, param_set_uint, param_get_debug_layer, &acpi_dbg_layer, 0644);
 139 module_param_call(debug_level, param_set_uint, param_get_debug_level, &acpi_dbg_level, 0644);
 140
 141 static char trace_method_name[6];
 142 module_param_string(trace_method_name, trace_method_name, 6, 0644);
 143 static unsigned int trace_debug_layer;
 144 module_param(trace_debug_layer, uint, 0644);
 145 static unsigned int trace_debug_level;
 146 module_param(trace_debug_level, uint, 0644);
 147
 148 static int param_set_trace_state(const char *val, struct kernel_param *kp)
 149 {
 150         int result = 0;
 151
 152         if (!strncmp(val, "enable", strlen("enable") - 1)) {
 153                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
 154                                           trace_debug_layer, 0);
 155                 if (result)
 156                         result = -EBUSY;
 157                 goto exit;
 158         }
 159
 160         if (!strncmp(val, "disable", strlen("disable") - 1)) {
 161                 int name = 0;
 162                 result = acpi_debug_trace((char *)&name, trace_debug_level,
 163                                           trace_debug_layer, 0);
 164                 if (result)
 165                         result = -EBUSY;
 166                 goto exit;
 167         }
 168
 169         if (!strncmp(val, "1", 1)) {
 170                 result = acpi_debug_trace(trace_method_name, trace_debug_level,
 171                                           trace_debug_layer, 1);
 172                 if (result)
 173                         result = -EBUSY;
 174                 goto exit;
 175         }
 176
 177         result = -EINVAL;
 178 exit:
 179         return result;
 180 }
 181
 182 static int param_get_trace_state(char *buffer, struct kernel_param *kp)
 183 {
 184         if (!acpi_gbl_trace_method_name)
 185                 return sprintf(buffer, "disable");
 186         else {
 187                 if (acpi_gbl_trace_flags & 1)
 188                         return sprintf(buffer, "1");
 189                 else
 190                         return sprintf(buffer, "enable");
 191         }
 192         return 0;
 193 }
 194
 195 module_param_call(trace_state, param_set_trace_state, param_get_trace_state,
 196                   NULL, 0644);
 197
 198 /* --------------------------------------------------------------------------
 199                               FS Interface (/proc)
 200    -------------------------------------------------------------------------- */
 201 #ifdef CONFIG_ACPI_PROCFS
 202 #define ACPI_SYSTEM_FILE_DEBUG_LAYER    "debug_layer"
 203 #define ACPI_SYSTEM_FILE_DEBUG_LEVEL            "debug_level"
 204
 205 static int acpi_system_debug_proc_show(struct seq_file *m, void *v)
 206 {
 207         unsigned int i;
 208
 209         seq_printf(m, "%-25s\tHex        SET\n", "Description");
 210
 211         switch ((unsigned long)m->private) {
 212         case 0:
 213                 for (i = 0; i < ARRAY_SIZE(acpi_debug_layers); i++) {
 214                         seq_printf(m, "%-25s\t0x%08lX [%c]\n",
 215                                      acpi_debug_layers[i].name,
 216                                      acpi_debug_layers[i].value,
 217                                      (acpi_dbg_layer & acpi_debug_layers[i].
 218                                       value) ? '*' : ' ');
 219                 }
 220                 seq_printf(m, "%-25s\t0x%08X [%c]\n", "ACPI_ALL_DRIVERS",
 221                              ACPI_ALL_DRIVERS,
 222                              (acpi_dbg_layer & ACPI_ALL_DRIVERS) ==
 223                              ACPI_ALL_DRIVERS ? '*' : (acpi_dbg_layer &
 224                                                        ACPI_ALL_DRIVERS) ==
 225                              0 ? ' ' : '-');
 226                 seq_printf(m,
 227                              "--\ndebug_layer = 0x%08X (* = enabled, - = partial)\n",
 228                              acpi_dbg_layer);
 229                 break;
 230         case 1:
 231                 for (i = 0; i < ARRAY_SIZE(acpi_debug_levels); i++) {
 232                         seq_printf(m, "%-25s\t0x%08lX [%c]\n",
 233                                      acpi_debug_levels[i].name,
 234                                      acpi_debug_levels[i].value,
 235                                      (acpi_dbg_level & acpi_debug_levels[i].
 236                                       value) ? '*' : ' ');
 237                 }
 238                 seq_printf(m, "--\ndebug_level = 0x%08X (* = enabled)\n",
 239                              acpi_dbg_level);
 240                 break;
 241         }
 242         return 0;
 243 }
 244
 245 static int acpi_system_debug_proc_open(struct inode *inode, struct file *file)
 246 {
 247         return single_open(file, acpi_system_debug_proc_show, PDE(inode)->data);
 248 }
 249
 250 static ssize_t acpi_system_debug_proc_write(struct file *file,
 251                         const char __user * buffer,
 252                         size_t count, loff_t *pos)
 253 {
 254         char debug_string[12] = { '\0' };
 255
 256
 257         if (count > sizeof(debug_string) - 1)
 258                 return -EINVAL;
 259
 260         if (copy_from_user(debug_string, buffer, count))
 261                 return -EFAULT;
 262
 263         debug_string[count] = '\0';
 264
 265         switch ((unsigned long)PDE(file->f_path.dentry->d_inode)->data) {
 266         case 0:
 267                 acpi_dbg_layer = simple_strtoul(debug_string, NULL, 0);
 268                 break;
 269         case 1:
 270                 acpi_dbg_level = simple_strtoul(debug_string, NULL, 0);
 271                 break;
 272         default:
 273                 return -EINVAL;
 274         }
 275
 276         return count;
 277 }
 278
 279 static const struct file_operations acpi_system_debug_proc_fops = {
 280         .owner          = THIS_MODULE,
 281         .open           = acpi_system_debug_proc_open,
 282         .read           = seq_read,
 283         .llseek         = seq_lseek,
 284         .release        = single_release,
 285         .write          = acpi_system_debug_proc_write,
 286 };
 287 #endif
 288
 289 int __init acpi_debug_init(void)
 290 {
 291 #ifdef CONFIG_ACPI_PROCFS
 292         struct proc_dir_entry *entry;
 293         int error = 0;
 294         char *name;
 295
 296         /* 'debug_layer' [R/W] */
 297         name = ACPI_SYSTEM_FILE_DEBUG_LAYER;
 298         entry = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR,
 299                                  acpi_root_dir, &acpi_system_debug_proc_fops,
 300                                  (void *)0);
 301         if (!entry)
 302                 goto Error;
 303
 304         /* 'debug_level' [R/W] */
 305         name = ACPI_SYSTEM_FILE_DEBUG_LEVEL;
 306         entry = proc_create_data(name, S_IFREG | S_IRUGO | S_IWUSR,
 307                                  acpi_root_dir, &acpi_system_debug_proc_fops,
 308                                  (void *)1);
 309         if (!entry)
 310                 goto Error;
 311
 312       Done:
 313         return error;
 314
 315       Error:
 316         remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LEVEL, acpi_root_dir);
 317         remove_proc_entry(ACPI_SYSTEM_FILE_DEBUG_LAYER, acpi_root_dir);
 318         error = -ENODEV;
 319         goto Done;
 320 #else
 321         return 0;
 322 #endif
 323 }